Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bayhaqi:18359Yaḥyá > al-Ḥasan b. Ṣāliḥ > Manṣūr > ʿUbayd Abū al-Ḥasan al-Muzanī > ʿAbdullāh b. Maʿqil

[Machine] Land cannot be sold without the mountain, except for the land of Bani Saluba and the land of Al-Hira, for they have a covenant. Al-Hasan ibn Salih said: We used to hear that what is below the mountain, beyond it, is reconciliation.  

البيهقي:١٨٣٥٩وَبِإِسْنَادِهِ قَالَ يَحْيَى عَنِ الْحَسَنِ بْنِ صَالِحٍ عَنْ مَنْصُورٍ عَنْ عُبَيْدٍ أَبِي الْحَسَنِ الْمُزَنِيِّ عَنْ عَبْدِ اللهِ بْنِ مَعْقِلٍ قَالَ

لَا تُبَاعُ أَرْضٌ دُونَ الْجَبَلِ إِلَّا أَرْضُ بَنِي صَلُوبَا وَأَرْضُ الْحِيرَةِ فَإِنَّ لَهُمْ عَهْدًا قَالَ الْحَسَنُ بْنُ صَالِحٍ كُنَّا نَسْمَعُ أَنَّ مَا دُونَ الْجَبَلِ مِمَّا وَرَاءَهُ صُلْحٌ